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KYIV, Ukraine — Artillery barrages along a section of the front line near an imperiled nuclear power plant in southern Ukraine struck towns, ammunition dumps and a Russian military base in intense fighting overnight, Ukrainian officials said on Sunday.

Reports of fighting all along the southern front suggested that neither side was pausing hostilities, even amid complex negotiations to allow for a team of scientists from the International Atomic Energy Agency to visit the Zaporizhzhia nuclear plant, which has been repeatedly damaged by recent shelling. The plant is controlled by the Russian military but operated by Ukrainian engineers.

The I.A.E.A. said Sunday that talks were ongoing with the goal of sending a team to the plant “in the next few days,” noting that the latest shelling “once again underlined the risk of a potential nuclear accident.”

The team would assess physical damage to the plant, determine whether the main and backup safety and security systems were functional and evaluate the staff’s working conditions, the I.A.E.A. said in a statement.

Russian forces fired rocket artillery and howitzers overnight at the Ukraine-controlled town of Nikopol, across from the plant on the opposite side of the Dnipro River, which separates the two armies in the area, a local military official, Valentin Reznichenko, said. The strikes damaged several houses and cars and knocked out electricity for 1,500 residents, he said in a post on the Telegram social networking site.

In a separate assault on the town, Russian helicopters fired rockets, according to the Ukrainian military, which reported damage to a house but no casualties.

The Russian Defense Ministry said its Air Force had hit Ukrainian workshops where helicopters were being repaired in the surrounding Zaporizka region, according to the Russian state news agency RIA Novosti. The claim could not be independently verified.

Artillery shells have already hit the Zaporizhzhia nuclear plant, damaging auxiliary equipment and power lines but not the reactors. The strikes — for which each side blames the other — have stirred fears of a radiation release if combat rages on in this area, an expanse of farm fields along the banks of the Dnipro.

After fighting severed one high-tension electrical line last week, operators in the control rooms implemented emergency procedures to cool the reactor cores with pumps powered by diesel generators. The electrical line has since been repaired.

In a sign of mounting worry over a possible radiation release in a country still haunted by the 1986 Chernobyl disaster, a Ukrainian official announced on Saturday that the government would distribute a drug, potassium iodide, that can protect against some radiation poisoning, to people within 35 miles of the plant.

Plant employees and outside experts say an artillery strike would not penetrate the yard-thick reinforced concrete of the containment vessels over the sites’ six reactors, but could damage the reactors’ complex supporting equipment or spark fires that could burn out of control. Artillery strikes could also breach less robust containers used to store spent nuclear fuel.

Ukrainian forces also reported striking targets behind Russian lines in occupied areas of southern Ukraine. The Ukrainian military claimed to have hit two Russian ammunition dumps in Kherson Province.

On the east bank of the Dnipro, a massive explosion early on Sunday shook windows and caused plaster to rain down from ceilings in the Russia-controlled city of Melitopol, according to the city’s exiled Ukrainian mayor, Ivan Fedorov.

Mr. Fedorov said the explosion had destroyed “one of the largest enemy military bases,” although the claim could not be verified. The base, he said, had been set up on the grounds of a factory complex.